connection problems

I have a RepRap Prusa-Mendel 3DP01 with a Melzi controllborad.
At repetier Host i only get waiting for Commands....
Pronterface is only "connecting...." and here is its log:
Traceback (most recent call last):
File "pronterface.py", line 1566, in connect
File "printcore.pyc", line 76, in connect
File "serial\serialwin32.pyc", line 30, in __init__
File "serial\serialutil.pyc", line 260, in __init__
File "serial\serialwin32.pyc", line 56, in open
serial.serialutil.SerialException: could not open port COM3: [Error 5] Zugriff verweigert
Sorry for my bad english.
I hope you can help me.
Max

it says " CAN NOT OPEN COM PORT 3 " try changing the com port setting ( inside Pronterface settings )

Thank you for help, i am using a memory card now.
Max